Cheryl's birthday puzzle.

Air all your daily pleasures and solve the World's problems over a cuppa of your favourite beverage.
Please note, no alcohol until after midday!

Moderators: godfather, Dreamweaver

Post Reply
User avatar
Global Moderator
Posts: 9231
Joined: 16 Sep 2005, 15:46
Location: Victoria

Cheryl's birthday puzzle.

Post by Dreamweaver » 15 Apr 2018, 20:06

When is Cheryl's birthday?
Cheryl tells Albert her birthday is either in May, June, July or August.

She then tells Bernard her birthdate is either 14, 15, 16, 17, 18 or 19.

Albert says he doesn’t know the answer, and he knows that Bernard doesn’t know either.
Bernard says at first he didn’t know, but after hearing what Albert just said, now he does know.
Albert says hearing what Bernard said solves it for him too.

The question was reportedly devised by the Singapore and Asian Schools Math Olympiad (SASMO) for Secondary 3 and 4 students.
Can you work it out?
I dream, therefore I am.

Post Reply